Screen



J. BLAND SCREEN Dec. 25, 1928. Re. 1 7,173

Origin ag Filed June 1, 1 25 3 Sheets-Sheet 1 [XiUexz/ar.

J. BLAND SCREEN Dec. 25, 1928.

Original Filed June 1; 1925 3 Sheets-Sheet 2 fiiz/enfor J'aiz fiZaizd DecQZS, 192s. BLAND Re. 17,173

SCREEN Original Filed June 1, 1925.7 :5 Sheets-Sheet s NHMVE Reissued Dec. 25, 1928.

UNITED STATES PATENT OFFICE.

"JOHN BLAND, OF TINTON, SOUTH DAKOTA.

scannn.

Original No. 1,610,353, dated December 14, 1926, Seriallio. 83,876, fled Iune 1, 1925. Application for reissue filed Kay 10, 1928. Serial No. 270,?20.

This invent-ion relates to a vibratory screen and particularlyto the vibratory elements by means of which the screen is vibrated. It has for one object to provide an apparatus for set-- ting up in a screen an extremely rapid vibration having a wide amplitude. Another object isto provide a spring element for use in. connection with a screen which will serve to give a. substantially constant degree of v1- bration throughout the length of the screen. Other objects will appear from time to t me throughout the specification and claims.

My invention is illustrated more or less diagrammatically in the accompanying drawin s, wherein:

igure 1 is a side elevation of thepreferred form of screen with parts in section and parts broken away;

Figure 2 is a plan view of the screen'shown 20, in Figure 1 with parts broken away;

Figure 3 is a' transverse cross section on an enlarged scale taken on line 3-3 of Figure 1 Figure 4 is an enlarged longitudinal fragmentary cross section of the end of the screen taken on line 44 of Figure 2; a

Figure 5 is a plan view with parts broken away showing a modified form of spring mounting A 1 Figure '6 is. a side elevation with parts. broken away and parts insection, showing a modified form of vibratory element; Figure 7 is a side elevation of one of the spring elements; i

.Figure 8 is a plan view of a modified form of the invention in which the screen is vibrated at its edges tor; a

Figure 9 is a transverse cross section on an enlarged scale, taken on the line 9--9 of Figure .8; p

Figure 10 is a similarcross section taken on line 1010 of Figure 8.

Like parts are indicated by like characters throughout. V p A is a foundation or bottom'm'ember for a screen. A, A are uprights'which support the screen. from the foundation member .A.

A"; A are side frame members of the screen.

They. are provided with inwardlyextending flanges A at their upper edges, and similar flanges A at theirlower edges. They are provided intermediate their lower and. upper edges with inwardly extending angle members A, A to which screen cloth sections A",

. solid portion 13.

as well as along its een-Y A are'fastened. The edges of thescreen cloth sections are held down to the flanges A by means of retaining strips A, They may be bolted or riveted in the position shown par- 7 runs off the screen. It is provided with one or more flat members A which serve to su 7 port the screen cloth sections and join the si e members A is a bottom plate fastened to the screen frame, preferably to the lower flanges of the side and end frame members.

B- is a spring member. It is mounted between the upper and lower screening surfaces. It is preferably made of wood, although it might be made of other material. It is preferably provided with a pair of generally triangular slots B, B cut throu h it and having their wide ends near the en s of the spring member and their narrow or'pointed ends extending toward each other andtoward the Above the solid portion B is preferably I mounted in the form shown'specifically in Figures 1, 2 and 3, the block C. Upon this is mounted a bearing C which carries one end of ashaft (1, the other end of which is mounted in'a bearing C and ivotally supported between the members .The. outer end of the shaft carries a driving pulley C b means of which it is rotated about a belt (l by a motor C or an other suitable power source. Mounted on tie shaft C is one or more out-of-balance fly wheels C, CF.

D is a feed hop er into which material is fed and from the ttoin of which it is discharged upon the upper surface of the screen. It is provided with an adjustable valve plate I)? which may be moved up or down with relation' to the hopper to varythe space between its lower edge and the upper surface of the screen and thereby to vary the thickness of spring member B is not fastened to the end of the frame. This figure shows it free from the lower end of the screen frame and supported only between the upper and lower scr'een sec tions. desirableto fasten this screen member at each end and for other purposes to leave it free at either end or both ends, and Fi ure is intended to illustrate this form. nly one end is shown because the other end, if left free, is

' the same as the end shown in Figure 5.

As shown in Figure 6 the vibratory element is of a different design. Instead ofmounting the out-of-balance shaft directly on the spring member B at the solid port-ion B it is mountcd upon a vertical member spring E. Thus a spring member E is provided which is fixed at its lower end upon a part of the foundation A. At its upper end it is fastened to the spring B beneath the solid parts B upon which is mounted in suitable bearings a shaft E which carries one or more out-of-balance fly wheels E and a driving pulley E3, through which by means of a belt E the shaft may be rotated from a motor E or any other suitable power source. 7

In Figures 8, 9 and 10 a further modified form is shown. As shown in this form there is provided a pair of side spring frame mem bers F, F. The screen sections F, F are mounted above and below these side-members.

Running between the screen sections and generally parallel to the side members F is a spring member G which is the same as the spring member B shown in the earlier figures and described in connection with them.

Surrounding the upper surface of the screen on its side and upper end is a material retaining frame work H. It is preferably out of contact with the upper screen surface but approaches itclosely, surrounding it except at the lower end and prevents spilling of material from the sides. This frame-work is supported upon members H which at their upper ends carry the framework and at their lower ends are fastened to a foundation or any other suitable support. The screen isopen at its lower end to permit discharge of material. 1

I is a bearing mounted upon the spring G and carrying a shaft I which carries one or more out-of-balance rotors IF.

J, J are bearings mounted one upon each of the side members F, carrying respectively shafts J J a each of said shafts being oined at its inner end to the shaft I by a flexible joint J. Each of said shafts carries adjacent its outer end an out-of-balance rotor J The shaft J 2 carries in addition at its outer end a driving pulley J which is rotated by a belt J 1 from any suitable power source.

At their ends the side frame members F are joined and held in proper spaced relation by means of tie rods K. Each of the tie rods passes through the side spring members F, the

For some purposes it has been found central spring member G and the frame sup porting members H. Each of said. tie rods is provided adjacent its outer end with a rubber or other flexible bushing K and through each of said bushings it is provided with nuts K These nuts are screwed toward each otherand the rubber bushings are thereby placed under compression and bulge out. slightly at their ends and adjacent their centers as is shown and thereby properly place the spring elements F with relation to the supporting members H and prevent lateral displacement or movement of these parts. rounding the tie rods at the points where they pass through the spring member Gr and engaging that spring member are additional rubber bushings K These serve generally the same purpose described with respect to the outer bushings.

There is provided for the screen in the first two forms a discharge receiving chute L, onechute being provided for each of the screen decks and one for the fines that pass through the lower deck. Thus three chutesare providedin all.

No such arrangement is shown for the screens illustrated in Figures 8, 9 and 10 but any suitable discharge receiving arrangement may be provided in connection with that form of the invention, and a bottom plate similar to the plate A may also be provided below the lower screen F or any other means provided, for receiving material which passes through the lowest screen.

Although I have shownian operative device, still it will be obvious that many changes might be made. in size, shape and arrangement of parts without departing materially from the spirit of my invention; and I wish, therefore, that my showing be taken as in a sense diagrammatic. Y i

The use and operation of my invention are as follows:

In the form shown in Figures 1 to 5 inclusive, the parts are assembled in the position shown. The rotary element is set in rotation and because of its out-of-balance it sets up a vibration- Since the rotary element is mounted so as to act upon the central longitudinal spring B, when it is in "ibration it sets up a vibration along this member, usually setting it in vibration in a wave-like motion. This sets up vibration and vibrates the two screen decks attached to the spring mem- 10 lower screen is carried down along'the bottom plate of the screen tom of it.

One of the important features of this form,

and passes off at the botof the invention is that th e screen cloth itself is directly attached to the vibrating'spring :ber B is generally the same whether or not 7 end and at its top is attached to the longitudi-- it be attached to'the frame at oneend or both ends. In either case a wave like vibration is set up in it and this vibration is transmitted directlyto the screen clot-h which is attached to this spring element.

In the 'form shown in Figure 6 the vibratory element instead of being mounted so as to-act directly upon the longitudinal spring element is mounted upon a vertical spring element. This element is fired at its bottom nal spring element/B. I Rotation of the out-ofbalance rotor causes lateral bending movement of the vertical spring member E. As this memberis bent laterally, and since itis held against pivotal movement at its .ends,'its vertical height is shortened. This periodical shortening of the vertical spring member due to rotationof the ou't-of-balance rotor sets up vertical-movement at the upper end of the spring member. This being attached to the Ion 'tudinal springmember B imparts to it a v1 rato movement and itis thus vibrated.

In the orm shown in Figures 8, 9 and 10 the central longitudinal spring member is generally the same as that shown in the other figures. In. addition to this, however, side longitudinal spring members are provided.

These may or may not be of the same construction but they are essentially spring niem bers,- ;The tie'rods which join and support all of. the spring members, that is, the central member G and the side members F, are positioned in-"rubbe'r or other flexible bush ngs.

' The bushings which contact the side supports H are the parts ,K. 'The central bushing" which passes through the central spring men) her G and. supports it is the member K". v

These rubber bushings or cups controlthc movement of the spring end particularly and serve to secure an even flexure of the spring throughout their length and thereby to secure uniformvibration of the springs throughout their length. The screen cloth is directly attached above and below these three longitudinal spring members..- Each ofthesecarries a bearing 'whichgsupports one 'or more outof-balance rotors.

spring members, in thiscase the members G and F, and a wave-like vibration is setup members.

When these are rotated a vibration is imparted to the longitudinal erably varied throughout its length so as to provide an equal degree of vibration through out its'length. For some purposes this might not be the case, but it is usually preferable so .to vibrate the springmember B that the .degree of vibration imparted from it to the screen cloth is substantially the same throughout the length of the screen.

I claim:

1. In a screen, a'screening member and a plurality of separated spring members'each noted that all of the forms of the invention attached to said screen member throughout I its length, and means for vibrating said spring members including an out-ot-balance rotor adapted to act directly upon said spring 2. In a screen, a screening member, and a spring member attached to a said screening member throughout its length and means for vibrating said spring member, said spring member being of varying flexibility through-.

out its length so that it is flexed substantially equally throughout its length.

3; In a screen, a screening member and a plurality of sprin members each attached to said screen mem er' throughout its length, and means for vibrating said spring members, said spring membersbeing of varying flexibility throughout their length so that they are flexed'substantially equally throughout theirlength. i' 7 4. In a scree'n, a screening member and a pluralityof spring members each attached ,to said screen-member throughout its length, and means for vibratin said spring members including aaout-oianoe rotoradapted to act directly upon'saidlspring memberssaid 5 ring members being of varying flexibility t rougliout their length so that they are flexed substantially equally throughout their length;

5. In a screen, a screening member and a frame for said member formed of members adapted to be flexed, in combination with a spring member adaptedto be attached tosaid screen member throughout its length and. means for vibratingsaid frame and said -SPI'1I1 member.

6. n a screen, a screening member an a frame for said member formed of mem ers adapted 'tobe flexed, in combination with a" frame for said member formed of members adapted to be flexed, in combination with a fill spring member adapted .to be attached to said screen member throughout its length and means for vibrating said frame and said spring member, the flexibility of said spring member being varied throughout its' length so that it is flexed substantially equally.

throughout its length. i I

8. In a screen, a screening member and a frame for said member formed of members adapted to be flexed, in combinationwith a spring member adapted to be attached to said screen member throughout itsv length and means for vibrating said frame and said spring member, said means including an outof-ba'lance rotor,the flexibility of said spring,

member being varied throughout its length so that it is flexed substantially equally throughout its length.

9. In a screen, a plurality of levels of screen cloth a plurality of spring members attached to each of said levels of screen cloth, and means for vibrating said spring members including an out-of-balance rotor adapted to act upon each of such springs, the flexibility of such springs being varied throughout their length so that each of them is flexed substantially equally throughout its length. 10. In combination with a screen having a screening member and a frame for such memher from which the same is supported, a selfsustaining resilient vibrating member extending from end to end of the screen and secured to it and means for vibratingsuch resilient member, including anout of balance rotor adapted to act directly upon such member.

directly upon such flexible member.

12. In a screen, a screening member and. a plurality of separated spring members each attached to said screen member throughout its length, and means for vibrating said spring members including an out of -balance rotor adapted to act directly upon said spring members, and a supportfor said screen in combination with a carrying member joined to the screen and to said support, said carrying member having flexible bushings at its point of contact with the screen and with the su )port.

13. n a screen, a screening member, and a spring member attached to said screening member throughout its length and means for vibrating said spring member, said spring member being of varying flexibility througln out its length so that it is flexed substantially equally throughout its length, and a support for said screen in combination with a carrying member joined to the screen and to said support. said carrying member having flexible bushings at its point of contact with the screen and with thesupport.

14. In a screen, ascreening member and a plurality of spring members'each attached to said screen member throughout its length, and means for vibrating said spring members, said spring members being flexibility throu liout their length so that they are flexed siilbstantially equally throughout their length, and supports for said screen in combination with carrying members joined to the screen and to said supports, said carrying members having flexible bushings at their point of contact with the screen and with the support.

15. In ascreen, a screening member and a. frame for said member formed of members adapted to be flexed, in combination with a spring member adapted to be attached to said screen member throughout its length of varying and means for vibrating said frame andsaid spring member, and a support for said screen in combination with a carr ing member joined to the screen and to support, said carrying member having flexible bushings at its point of contact with the screen and with the support.

16. In a screen, a plurality of levels of screen cloth, a plurality of spring members attached to each of said levels of screen cloth, and, means for vibrating-said spring memhers including an out-ofsbalance rotor adapt-- ed to act upon each of such springs, the flexibility of such springs being varied throughout their length so that each of them is flexed substantially equally throughout its length and; a support for said screen in combination with a carrying member joined to the screen and to said support, said carrying member having flexible bushings at its point of contact with the screen andv with the support. f

l7 In combination with a screen having a screening member and a frame for such member from which the same is supported, a self sustaining resilient vibrating member extending from end to end of the screen and secured to it and means for vibrating such resilient member including an 'out-of-balance rotor adapted to act directly upon such membcr and supports for said screen in combination with carrying member's'joinedt'o the screen and to said supports, said carrying members having flexible bushings at their point of contact with the screen and with the support.

18. In a screen, a screening member and means for vibrating said screening member, a support therefor, a carrying member'joined to said support and to said screen and sup:

ported at its point of attachment to ,said screening member in yielding bushings.

19. Ina screen, a screening member and means for vibrating said screening member,

a support therefor, a carrying member joined to said support and to said screen and snpported at its point of attachment to said support and to said screening member in yielding bushings.

20. In a. screen, a screening member and means for vibrating said screeningmember,

I a support therefor, a carrying member joined to said support and to said screen and supported at its point of. attachment to said screening member in yielding bushings, and

adjustable means for compressing said bush.- mgs. I

"21. In a screen, a screening-memberand means for vibrating said screening member. a support therefor, a carrying member joined to said support and to said screen and supported at its point of attachment to said sup port and to said screening member in yielding bushings, and adjustable means for compressing said bushings Signed at Chicago, inthe county of Cook and State of Illinois, this 23rd day of April JOHN BLAND. 

